Re: [Ksummit-discuss] [TECH TOPIC] mobile phones

[Pavel Machek <pavel@ucw.cz>]

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Hi!

> > Oh, another major piece is DSP coprocessor that is there. Unlike
> > graphics, we don't even know how support for it should like.
> 
> https://www.kernel.org/doc/Documentation/remoteproc.txt
> 
> config OMAP_REMOTEPROC
> 	tristate "OMAP remoteproc support"
> 	[...]
> 	help
> 	  Say y here to support OMAP's remote processors (dual M3
> 	  and DSP on OMAP4) via the remote processor framework.
> 
> 	  Currently only supported on OMAP4.
> 
> 	  Usually you want to say Y here, in order to enable multimedia
> 	  use-cases to run on your platform (multimedia codecs are
> 	  offloaded to remote DSP processors using this framework).
> 
> 	  It's safe to say N here if you're not interested in multimedia
> 	  offloading or just want a bare minimum kernel.
> 
> I have been told by some Nokia people (I do not remember who it
> was, possibly Sakari), that the DSP is not that powerful and any
> calculation should also be possible on CPU (wasting a bit of
> energy).

Ok, we probably don't care about DSP, but lets say we had really
fast DSP or really cared about power.

We'd need remoteproc. Sure. But that has no interface for userland,
right?

So we'd need to introduce interface for userland... fine.

And then we'd need cross-compilers for the DSP used. Ok.

And then we'd need to split mpg123 to CPU and DSP parts, and modify it
so that it can run the DSP parts using remoteproc, when available?

That starts to be ... complex, with changes all over the system :-(.

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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